S&S CYCLE High Volume High Pressure Oil Pump Kit With Gears for '84-'91 HD® Big Twins - 31-6307

Originally designed for S&S^® 4 1/8 bore V-Series engines with piston oiler jets, these high volume high pressure oil pumps also work well in stock HD^® Evolution^® engines and S&S^® V-Series engines. Fits 1984-'91 HD^® Big Twins. No thicker than a stock pump. Gears with fewer, but larger teeth provide increased oil volume for both supply and return sides of the pump. Supply gears are 9% wider than stock and standard S&S^® oil pumps. 28% wider than stock return gears ensure proper crankcase scavenging, reduce drag on the flywheels, and eliminate oil carryover. Polished Billet Finish. Increased scavenging capacity results in Less oil in the crankcase, Less oil carryover, Excess oil from pressure control valve is filtered & longer pump life. Equipped with a stock length oil pump drive shaft. We do not recommend the HVHP for shovel engines, as it may over oil the top end unless the oiling system is modified with the S&S^® valve train update kit.

• HVHP oil pumps have a new gear tooth profile with fewer but larger teeth that provides an increased oil volume for both supply and return-side of the pump
• Supply-side gears are 9% wider than stock
• Return gears are 28% wider than stock to ensure that the additional volume of oil supplied to the engine is scavenged and returned to the oil tank, reducing the amount of oil in the crankcase breather
• Kits include supply gears, return gears, drive shaft, drive shaft keys, drive shaft snap rings, check ball, check ball spring, pressure valve spring, cover screws with O-rings, miscellaneous hose fittings, plugs, screws, gaskets, mounting hardware, oil pump drive shaft gear, oil pump pinion shaft gear, S&S breather gear and shim kit and instructions
• Oil pumps only include supply gears, return gears, drive shaft keys, drive shaft snap rings, check ball, check ball spring, pressure valve spring, cover screws with O-rings, miscellaneous hose fittings, plugs, screws, gaskets, mounting hardware and instructions
• Made in the U.S.A.
  
  NOTE: Pinion shaft gears included
  
  NOTE: *Pinion shaft gears included in these kits fit stock 1984-’89 pinion shafts and S&S pinion shafts for 1984-’99. Will not fit stock 1990-’99 straight pinion shafts. Standard style covers have feed and return holes in the stock locations. The universal cover has a number of oil feed and return options, allowing maximum flexibility for customized applications

Specs